公路隧道照明中对比显示系数阈值研究
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摘要
文章建立了对比显示系数阈值与阈限亮度差之间的关系,采用定值刺激法来研究阈限亮度差。通过实验得到了负对比、观察视角6.88'时不同背景亮度下的阈限亮度差ΔL0,并通过观察者年龄修正系数Ka、小目标物显示时间修正系数Kt以及小目标物正负对比修正系数Kf来修正阈限亮度差,最终得到了负对比、观察视角6.88'时不同背景亮度下的显示系数阈值qc0
The function relationship between contrast revealing coefficient qc and minimum luminance threshold ΔL0 is built up by formula derivation. The minimum luminance threshold experiment can be done by constant value stimulation method. Then the minimum luminance threshold value under situation that luminance negative contrast and viewing angle is6.88 minutes could be determined. Secondly, the minimum luminance threshold value should be corrected by age correction coefficient Ka, correction coefficient of small target observation time Kt and the correction coefficient of luminance positive and negative contrast Kf. Finally, the threshold value of contrast revealing coefficient qc0 which based on the small target visibility can be got.
The function relationship between contrast revealing coefficient qc and minimum luminance threshold ΔL0 is built up by formula derivation. The minimum luminance threshold experiment can be done by constant value stimulation method. Then the minimum luminance threshold value under situation that luminance negative contrast and viewing angle is6.88 minutes could be determined. Secondly, the minimum luminance threshold value should be corrected by age correction coefficient Ka, correction coefficient of small target observation time Kt and the correction coefficient of luminance positive and negative contrast Kf. Finally, the threshold value of contrast revealing coefficient qc0 which based on the small target visibility can be got.
引文
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[2]CIE.Calculation of Tunnel Lighting Quality Criteria:CIE 189:2010[R].CIE Central Bureau,2010.
[3]Code of Practice for the Design of Road:BS 5489-2:2003+A1:2008[S].2008.
[4]CEN.Lighting applications-Tunnel lighting:CR14380-2003[S].2003.
[5]翁季,陈秀雯,黄珂,等.公路隧道照明对比显示系数探讨[J].灯与照明,2013,37(1):4-7,16.
[6]张晟鹏.城区机动车道路照明可见度研究[D].重庆:重庆大学,2006.
[7]翁季,蔡贤云,杜峰,等.公路隧道照明中基于小目标可见度的对比显示系数研究[J].照明工程学报,2015,26(6):87-90.
[8]Black Well H R.Contrast threshold of the human eye[J].Journal of the Optical Society of America,1946,36(11):624-643.
[9]Adrian W.Visibility of target:Model for calculation[J].Lighting Res.Technology,1989,21(4):181-188.